Afghan President Ashraf Ghani, left, former President Hamid Karzai, center, and Chief Executive Abdullah Abdullah, right, attend a ceremony marking the completion of security transition to Afghan security forces in Kabul, Thursday, Jan. 1, 2015. Afghan police are investigating a rocket strike on a wedding party that killed at least 28 people, many of them women and children, an official said Thursday, as President Ashraf Ghani marked the country’s transition to full sovereignty after the 13-year international military mission to rid Afghanistan of insurgents officially ended. (AP Photo/Rahmat Gul)